Types and use of dry ramming materials

2022-06-17 09:47:05

Dry material is dry vibrating material collectively, there are many called dry mixing, because its construction method is more than ramming, and called it dry ramming material.


This kind of dry material is in the dry state, the use of vibration or pounding method of construction and use, according to the material can be divided into just jade, silicon, silicon aluminum, magnesium and magnesium calcium and other types.


Dry material is mainly used in induction furnace, aluminum melting furnace, tundish and steelmaking electric furnace lining, dry ramming material in the construction, is to put the ramming material into the mold and permanent layer or the space between the furnace shell, after vibration ramming after baking and then use.


The working principle of dry ramming material is: after the completion of construction or after heating and baking, when the hot surface should form a certain combination and have a certain strength, the mold can be removed or not removed to let the steel die melt into the molten iron or molten steel.


If it is in the smelting process, the working face in contact with molten metal or slag will quickly form enough strength, or form a dense sintering layer resistant to slag and metal penetration. A loose and unsintered state remains behind the sintered layer. As the corroded sintered layer of furnace lining advances from inner wall to outer layer, the thickness of dispersed layer decreases gradually.


The role of unsintered loose layer is threefold. First, after a furnace service, the loose layer is still unwound, and it is very easy to fall off when the furnace is turned over. And there are thermal insulation effect, reduce the heat dissipation of furnace lining, reduce the sintering of loose layer. The third function is to prevent metal penetration.


Dry ramming material at the same time play the role of heat insulation and wear-resistant permeability is two contradictory points, heat insulation requires small accumulation density, high permeability requirements. Therefore, the production process should determine the proportion and granularity of dry ramming material according to the actual situation, but also pay attention to the choice of binder and burning aid and the influence of particle size on the ramming material.